For an ideal gas, the activity co-efficient is_________________?

Related Mcqs:

1. The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________?

   A. V1/V2
   B. V2/V1
   C. V1 – V2
   D. V1.V2

2. Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?

   A. Decreases
   B. Increases
   C. Remains constant
   D. Decreases logarithmically

3. For an ideal solution, the value of activity co-efficient is______________________?

   A. 0
   B. 1
   C. 1

4. What is the value of ln y (where y = activity co-efficient) for ideal gases ?

   A. Zero
   B. Unity
   C. Infinity
   D. Negative

5. Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the___________________?

   A. Nature of the liquid
   B. Nature of the gas
   C. Temperature of the liquid
   D. Total pressure

6. The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?

   A. Measures the elevation in boiling point
   B. Is not dependent on the temperature
   C. Is a function of the liquid phase composition
   D. Measures the depression in freezing point

7. What is the value of Joule-Thomson co-efficient for an ideal gas ?

   A. +ve
   B. -ve
   C. 0
   D. ∞

8. The activity of an ideal gas is numerically ____________ its pressure?

   A. More than
   B. Less than
   C. Equal to
   D. Data insufficient, can’t be predicted

9. The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be________________?

   A. 2M
   B. M/2
   C. M
   D. M/4

10. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is_________________?

    A. R loge 4
    B. R log10 4
    C. Cv log10 4
    D. Cv loge 4